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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ae807a3290187645d75975b128b35f78388bb0a1b2dc11ccd644da75feca8d' 
  AND token = 'p/2Li3LxiIjS4m3zk6eeYFGCbNGbsSI0PsA+/fGflpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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