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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a8deb49a52a12ac8d13f1a48079543c86a8099be0cc2c30aed60f6df6471e7' 
  AND token = 'UijycN5F9LdLlXfU+Mel3PI/E0iW2TsRRjS05gV0zPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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