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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44d9d1bbc8619dbf3982d46921fd11e1993444664a8291bfbd7018d44924744' 
  AND token = 'PhPlsH4O1orBpD2Xf4zO3zvM7SwRf2uLcUhrxJ5Pkhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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