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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ab8a6374a55893993d5217a304ea471b5ca1fddff1c2b47ef361d87a552d40' 
  AND token = 'SSnAGCuzhC7I1fEl6UU0l+Qx12cn8LW5R5lnKbi+VP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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