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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a2226f4fbfde091a16e9d148fa56c3eca95efdf85f31408db03b20b68948db' 
  AND token = 'W/2u+TY/+KkTqLPWt3IIu6/d/IMFHU9yd1+SvP05xKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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