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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a004b0812516b840b8c54fe8814b5dcacd3b0bd5accbd0276873d6f1e8228c88' 
  AND token = 'JPPFaYtBNBvLLTx9eYjv4A1BWVpAQ8/xMDa6kCHWFM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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