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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf905408561bc756215cac0b82acb7b1529770f442dc28f74cb2f9846f92cbc1' 
  AND token = '20ZSFe/Zyio2spxkvoxjvNbgwoiLQ7AQDE5IeY9XdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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