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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81927cf8123633de600521f6b5be87e66f97fec6f164861367f53716ac03f1f' 
  AND token = 'OkW8l/aJ3ph1mpP0asH9Alea1CDc9hAtQqm5eWt9NVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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