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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ef8840fb84b7f725596c9c8104c64d0cd67e04925ad94a26383b47788c7567' 
  AND token = 'YFcg6OTyBbLHN3WlfuN6c7NtAtQceyDyCh2wuYl/5XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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