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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9738425066c9fc1baa1798aefe51832bbae4634983c606a9b62f285bea053ce8' 
  AND token = 'AtHjKiHvU6IktSIHWjlDKVYOdZuxcpkh8mg0C3350fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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