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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878e1f84ca9185678dba3ea32179f0b57bc15dd7f7128ea6b732519b091af7ec' 
  AND token = 'MHHR3AUqGNc0QWFnP7+TUSpL9Aq902iWcb3qI0eleVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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