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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f225cd4b942892e38c2c0f7936fa593d34671ee1236dfa084831629a1dc39fad' 
  AND token = 'MBLnaSg4A4plTYruJ9G9h8zRdds9vJlS1AkEdd2p+80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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