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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86d5515e6d8d25390c4a860a3f48a9eefb3dbe928be70781270ac21d39853b8' 
  AND token = 'kc5BefG+j/PBeIUYviSYizE2FDnaDi9xfOWTxcgCW+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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