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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9652c64f0d340a79e20c33104f21267bf71796417e104c1fe7b332b0959ad82' 
  AND token = 'lNKc+F9mj7Uchk1z2bZ9scadjksOvoodjI7VHK1wOMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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