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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240f829710d537b0bc033b990f35e7d246f54d4de81f0e2300fc239b7d6219e8' 
  AND token = 'IOHwX2CxIOxFoviAs5BUs0byCI6kBfXi3JpKfThKfd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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