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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bf81a2dc28e498ccc5b50707f017f2a45ddb5886e3947a302f2dae3ee37eaf' 
  AND token = 'hWUT2re0memu1MMqr4yLedC5aq3BzIVieUo4lYyrpxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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