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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6310d1f30d0dfe7b4f4826e94e02f32966c21c594b1ba36b42698baca8fbbe6e' 
  AND token = 'rvx+Jj0ygUru9X7J/mmg30NfIBkTI+4SXmRyHPqmTWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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