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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ad3dc018e3979a7f58cd3d276243d27594df31c844d5819f210f935b08f924' 
  AND token = 'eN3OhWMCt490yqE7RYZZ0Io2+3xkCKKSJPa/biSl2KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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