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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c1497a3ba39acb5ba2137f90354549c6d22374443c31ce6839af4e4810a622' 
  AND token = 'AK+ZWW9j/auy2fAsZhREw17xz3bHWElIukNH1flWLoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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