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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a3e3efdc141a8e3cd194ad2e7b04fe4f1810fcb74793f4ef9b4333857974f9' 
  AND token = 'Y/8M0enC4MvTo1UOaJP9ekfRI3fAa2u1y4WmoN+eXlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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