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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76241fa3a0c803fec088f176387cb01f999c8ad65a39837438b5ea9e48872dd0' 
  AND token = '0JUEyN8tJ/nz1jCYllOoo15MAp35wrtF/+fv/3raCbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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