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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b837a287578bc119fbb2be0827a5a72f2a67e7d8c66567df27ca7279bc3e5d' 
  AND token = 'to64B4Xb0jhH0JaCW344WHlQ72AP9xMDv8xQFCnGxVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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