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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1a5f55e827d0e212ceef2ba2294770d11b08bcddec2e77ea1783e62db0ad64' 
  AND token = 'EC4uTStJReJPvJ5S/nS8sy72CE7sWGiZre2WxK+/ysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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