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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f3e946809bea1c9baa6b3a534c5501e0a71f05d402405467e4e83c19c9ba83' 
  AND token = 'boHy41Ym00z1yV9XNEVJSEP/GUNirEsnh2W/phjmY6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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