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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae450e633dc74ab4b9d357e4b745773fc6dc852c389ebc699f6c7e4fdf18acd' 
  AND token = 'GLr5Qp/jJlGFLH01gbilPq9GyGWh1S6i97g830P+Fxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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