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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7046be6c52847d0ed882bad0ba7d4a7e8e9576b881d2dc5d88b362f0e087d499' 
  AND token = 'i4GvgPoWx2CorssYbRzqaJXhTiXBraf9J0cAPd09Os4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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