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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8980c36e2ef1116de163c151a73da1e7c7359adb6dedce01ec115627f4fa4228' 
  AND token = '5wEy/OE2t/15AgD0ya4jLPtC7C4EOw9KjhStI1/SFYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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