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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd69f789419f6397739cb18a2c491a6794d74217c1cb4095c8b8fd697c145273' 
  AND token = '4aNKkLN+F3fgtkcAHDq0DsdJT4ZuZElCQBc79ugjRSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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