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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a8ff4c8dcaef2d75d65e5dcc2cfbbaae538ef33b94eee26f76eeeeb1436ed' 
  AND token = '6m2H5aKY2r94MU5Ml9xpp4K94M/gnYw8pMOS15cS/fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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