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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6c9208d9450847128c26d4d47f6f8bbfd552dffc3ef6d17bbc439d3229a108' 
  AND token = '3UuH/EVbcqaR3V4to8TGrwEu03JaOhiWdpnyjzRJFnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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