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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9ddd84d04f8843bc8228f7611b6e93b4b39286bd766e48b16b6494b58485c4' 
  AND token = 'iibZpP1lE8pNEEMsszWZTsCgp97vA7BmS4T/+NA31FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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