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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fd4272f9c16e6e3c2b30c4c08e88239b1cfd2482a4a32706d06d87118b9f6e' 
  AND token = 'xFYzVPleUoY+0le/XcP8ugDxtfHyQFowXCsfKSbfml0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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