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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d64570ca3b20f56ba2a7fbbd011c9406b4e5cf33b91bc4918575cb6d035a57' 
  AND token = 'WAg03aMjxq7I0Szvpr9PeUgWJfLCix8hxCn5kY7j5wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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