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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0f76b1930127e57e54af2cbaca0310f0f91360ca45eb80c374e3e158377730' 
  AND token = 'w4qrJpQFuE1cW4hwJn25DREtTgG5V74p3fzsWGGNYrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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