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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8894d22b8bf34f643420974140fed0c622fff3d3eab0bde7c3ce37349680c6c' 
  AND token = '564da3o97tbOF+vHlSAPV+lNZRkQCtaXl+e0MXY9/J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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