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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b3e8a37070e63bf29ed512f116091595914f7a48a1a2b4e090f70be5fd4666' 
  AND token = 'NiWEJTBV3C/eNHIpr1ljCBcz7uiM+kkAu2fCQl1t4uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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