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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084e0fbe042ff85c83d1ff2d64d3771b16342d53d55d401eb2ec92b7bd9133fe' 
  AND token = 'bUU9qD5L1if0vN23Lu7A+FxqayZmag+es7nlXAnEEg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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