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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ea35be33a4422575cbe9b814cdd20ed8aabd3369692dfd96ecc42ce2c4776d' 
  AND token = 'Sx2hlM79WVsBh5u/ne4gCUk+VfxQ9wnsv68aJz/6jrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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