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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fcc070de9d415df7bfb35bbb0ae02e902d00448f08fc6c5d23e33be136992d' 
  AND token = '2nf4zP8/VjOB5jEFVJ1018720kV+ltDHbFOSNmjOk40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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