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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99a8142500426f41c7a0fd21efed83b2cd7ffc76cbd5ac8f1ea70048eb81da1' 
  AND token = '/cymq9qR75bQKGczhpotssLIWivIfz2TN4aEqogH9wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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