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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4186c008d7accdc9935c118bcb5f82d5d4dc2c65ad657ca47d9f750147bb5b' 
  AND token = 'wR57fbEe6Z8UFTC8VdoWtBz3roWCIdLWNHD43avZxO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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