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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d51b32958df456bc201d606f99a3105d61ce488dff510d72a2f25ee91f8e7d' 
  AND token = '38n5fk//rSl7jicVgRboZon1Ww+ZP3/TgfK3tVeAJlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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