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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb092a61f7896a94cb1985ba28916427240e59fdcb434f52892f74a9756e3d38' 
  AND token = 'APM581WHrXTB35ljDzyJ+sw5iZB07Pt3W6ec6M6wxhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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