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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4c63bff78c0322309eb28b95f1538da9e98e9fe8272eb172ebebb3537deca7' 
  AND token = '7HLYjsqT3sqJ7Jus2rKlitjmTl4OnJo44or5z/zwgaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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