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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1766e16a1cb03189544415a6f0ea370b25d9e41459d3ad333a6e7ae8508716' 
  AND token = '3lOicj4AzDl1BlWtbn2DF2/LcSSFix3tXnaboo9SZw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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