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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3f443637f1812c68fc33c4c651612bc7ed5ff9ee3b84861dfdedd50c774a45' 
  AND token = '+pHNl7RpxZErkQ9azUJMU0FLdIzbmbiFcUqnfJD/ZRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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