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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73cab5c49758805bab4a8616f5e7e964788e7ea7a63a8a7a2bb7192c5c108c9' 
  AND token = 'ha1rd9vOJQbFamNDOn3U4/uaJaENDaAwl9+BLrOb9Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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