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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214a818d4a47a60e7b5c8bfedacbe1c1d898249eb9b6479eec320069ae9b36e4' 
  AND token = 'ggGUgD6kD0bQRdFc+HJ/9P7V4a4dyArl7lKhcxjIBzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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