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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5a0a969503276e3dd16f898d6998df4744adfcf5f9f3f1277438e639ffd8ac' 
  AND token = 'vvzqEOX5t/oEOBNDSQTmiv2Vqb8Ku6deqBsp143bDpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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