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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597633e30d9cadc43a5978820b305c6fa3d8062055ca17c137517c86620052f4' 
  AND token = 'LW9y412+ubqMegyyIEy36CmN01ZdnaKyD3k+tKCkdsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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