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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693578a3768f236e78f513b0f2828e22dbcdc6a1cb1abb09a2734d7d04cf615e' 
  AND token = '5Cnb9fq5Mn7M1mQzgimw7we2stX8NJeQaC6b9sc/ceU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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