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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac41d03aff2273fcdaef8f59d085717aed290da79ca6cc3efcfccf4ddcfa508a' 
  AND token = 'Uvu7MJMwJLpMq0q/H6VPKRLf31PF8gC7aLrW2I+Fd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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