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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f11c2ef9302da42db0bbc9e4a568ee5d4e91f32c97865cdb4a7387e39b8dffd' 
  AND token = 'YDFpNoFbc1hmblc/PY46XpA8FUZeEZcYt5yYtWilJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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