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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d9c0b9968f2eef8e4d0223e0cb086d917a80c2a7ea16cc4690cf8204f18bbc' 
  AND token = 'Rl9OQqd9Fg4ElauG2YgGtb2iDxqfqRKcGjnayLZZov8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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