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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fd992f2f6c493051221550ada93f9a4bf4daf379281fa53336c619a4f0e3ed' 
  AND token = 'BqC4xc1e6wgvZRDXTpy9sUaQb04EoTa8V03XmtmEdYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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