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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e27f9dd6f1b9c3dee74a3186e6a9ae281bd98d0555edee3306fbf56a654afb' 
  AND token = 'k4xdq4+kTpVwLey0e1CT7LrrkiSQtnumbVW6pQodSz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}