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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a1a062c0bb8304ca1b534bc88a5fbc9b34090f7d6a0be3b745c6c33878bdcb' 
  AND token = 'rnNqBOs+Ame7FioBBWHmCF0oXdouMHLehM75Rz52pDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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