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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511084e4660243f96c048232d48072af5e447dde0d7a3a3da59421a2144c0f83' 
  AND token = 'aVX6NBns3KzCEAr6e5Cu3/E6u0s8/Xot89UpXk1+se0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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