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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c023a1da88e7f181b3fbdbefe7b140228d3f3d5d1caa839d6f0e1b4b21d300f' 
  AND token = 'Ku+24fnqvWh5Rdl5l6pHWrZ+0VK6xsna36tKu7eOatw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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